Lathe drive-dog



A. H. WELLS AND J. D. KELLOGG.

LATHE DRIVE DOG.

APPLICATION FILED mm. 1919.

Patented Nov. 25, 1919.

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ABCHIBALID H. WELLS Aivn JOHN'ID. KELLOGG, onsna'r'rnn, WASHINGTON.

LATHE DRIVE-DOG.

Specification of Letters Itatent. Patented NOV. 1919;

Application filed January 6, 1919. Serial No. 269,854. 1

To all whom it may concern: 1

Be it known that we, ARoHIBALD H.

WELLS and JOHN D. KnLLoee, residing at.

Seattle, in the county of King and State of Washington, have invented certain new and useful Improvements in Lathe Drive-Dogs, of which the following is a specification.

Our invention relates to certain new and useful improvements in lathe drive dogs especially adapted for use in bolt making and the like, and in its general nature the invention has for its object the provision of a drive dog of this character of a Simple and effective construction, the parts of which are reduced to the minimum and are of such construction and design that they can be manufactured at a minimum cost. Another object of the invention is to provide a lathe drive dog in which the parts are so designed as to be as near balanced on the head plate of the lathe as possible so as not to throw additional work on the lathe head stock bearings, due to the head plate being out of balance to any great extent when the invention is used.

More specifically, the invention comprises a base plate or bracket having a pair of slotted arms adapted to be secured to the head plate of the lathe and straddle the center of the same. To the bracket or base plate are adjustably secured the bases of the finger elements which project on either side of the bolt head and hold it from turning. These elements are of like form but one is a right and one is a left.

The invention also resides in those novel I details of construction and arrangement of parts, all of which will be fully described, then be specifically pointed out in the appended claims and illustrated in the accompanying drawings, in which:

Figure 1 indicates a radially slottedhead plate of a lathe which may be of the ord i nary type and to which our invention is adapted to be secured.

Fig, 2 is a perspective view of the base member that is adapted to be secured directly to the head plate of the lathe.

Fig. 3 is a perspective view of one of the finger elements and its base portion.

Fig. 4 is a perspective view of the other finger element and its base portion.

Our invention comprises a base bracket consisting of the top flat portion 2 having bolt apertures 5 and the legs 3 which project at right angles to the plate 2 and are longi tudinally slotted as at 4 so-as to be. adjustably secured to the head plate 1 by bolts 11. The finger members 8 are pendent from their respective bases6 from which they project at right angles to the'plane of the plate 6,

theplate'? being longitudinally slotted as at 7 whereby the clamping bolts 12 may adjustably secure the fingers 8 in place on the base 2, as shown in Fig. 1. 13 is the center of the lathe and 10 designates a bolt'blank whose head 9 is held between the adjacent parallel edges. of the fingers 8 to prevent the same from turning on the center, it being noted that this gives a two sided engagement with the bolt head 9. It will be noticed that the fingers 8 are independently laterally adjustable by virtue of their slots 7 and the finger members and base member are adjusted at right angles to the said lateral adjustment of the fingers by virtue of the slots 4. Furthermore a lateral adjustment of the fingers 8 and base 2 as a unit can be eflected by shifting the bolt 11 in the radial slot of the head plate so regardless of the particular shape of the head 9 or regardless of whether or not the head 9 is true to the center or axial line the device can be readily adjusted to the same.

From the foregoing description, taken in connection with the accompanying drawing, it is thought the complete construction, uses and advantages of the invention will be clear to those skilled in theart towhich the invention relates but we desire to say that by making the several parts shown in Figs.

2-4, inclusive, of thin metal, the same can be stamped or forged out and made of comparatively light material and any one of the parts can be replaced in case of breakage without the necessity of replacing the entire unit since the parts can be made to standard size and interchangeable.

What we claim is:

1. A lathe drive dog comprising a base member havinga base plate and a'pair of legs projected therefrom at right angles, which legs are provided with longitudinal slots by means of which the base member maybe secured to a lathe head plate, and a pair of finger members each comprising a longitudinally slotted base plate adapted to lie in engagement with the base plate of the base member and a finger pendent from one end of the finger base plate and means for clamping the finger plates together to the base plate, all being arranged whereby the position of the dog, on the lathe head plate, can be adjusted in a direction at right angles to the adjustment of the finger members with respect to the base plate, said finger members being independently adjustable on the base plate substantially as shown and d e= scribed.

2. The combination with the lathe head plate having a center and having radial slots; of a drive dog including a base member which'comprises a base plate adapted to extend at right angles to the face of the lathe head plate, and having legs provided With longitudinal slots and extending at right angles to the said base plate and bolts securing said legs to the head plate of the lathe, said bolts passing through said radial slots, the.

slots of said legs lying across the said ra dial slots and said legs straddling the cen- ,dinal slot and a pendent finger extending from said base portion, means for clamping the base portions of said finger members to Said base plate of said base member whereby said finger members will straddle the center axial line of the lathe head plate and whereby said finger members may be adjusted laterally with respeot to said center line, all being arranged substantially as shown andfor the 30 purpose described.

ARCHIBALD WELLS. JOHN D. KELLOGG 

